| RT | radiologic technologist; radiotelemetry; radiotherapy; radium therapy; rapid tranquilization; reacti... |
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| RPA | radial photon apsorptiometry; replication protein A; resultant physiologic acceleration; reverse pas... |
| rT3 | reverse T3 |
| HMRTE | human milk reverse transcriptase enzyme |
| HRTE | human reverse transcriptase enzyme |
| RPH | reverse passive haemagglutination |
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| PHA | Passive Haemagglutination |
| RPHA | Reversed Passive Haemagglutination |
| PHAT | passive haemagglutination test |
| RPAR | reverse passive Arthus reaction |
| reverse passive haemagglutination | If antibodies are bonded to the surface of red blood cells haemagglutination will occur if the appropriate bi or multivalent antigen is added in soluble or microparticulate form. Used as a test for for example Hepatitis B virus in the serum. (18 Nov 1997) |
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| passive haemagglutination | A kind of passive agglutination in which erythrocytes, usually modified by mild treatment with tannic acid or other chemicals, are used to adsorb soluble antigen onto their surface, and which then agglutinate in the presence of antiserum specific for the adsorbed antigen. Synonym: indirect haemagglutination test. (05 Mar 2000) |
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| viral haemagglutination | The nonimmune agglutination of suspended red blood cells by certain of a wide range of otherwise unrelated viruses, usually by the virion itself but in some instances by products of viral growth, the species of erythrocyte agglutinated differing with the different viruses. See: haemagglutination inhibition. (05 Mar 2000) |
| haemagglutination | <haematology> Agglutination of red blood cells, often used to test for the presence of antibodies directed against red cell surface antigens or carbohydrate binding proteins or viruses in a solution. Requires that the agglutinin has at least two binding sites. (18 Nov 1997) |
| haemagglutination inhibition | A variation of the haemagglutination technique. Some viral antigens, when coated on erythrocytes, spontaneously cause agglutination in the absence of antibody. In these situations, the specific antigen-antibody reaction actually prevents the agglutination of reagent RBCs. Haemagglutination inhibition cannot differentiate between isotypes of specific antibodies (IgG, IgA or IgM) although positive haemagglutination inhibition analysis of specimens treated with Staphylococcus aureus Protein A (discussed above under coagglutination) to remove the IgG isotype antibodies has been used to imply the presence of specific IgM antibodies to the specific viral antigen. The crude quantitation of the specific antibodies is possible using serial dilution (titre). (05 Mar 2000) |
| haemagglutination inhibition test | <investigation> A clinical lab test used to detect the presence of a certain haemagglutinating virus or other haemagglutinin antigen based on whether the red blood cells in the sample lose the ability to clump together when the antibody to the virus or other antigen is added to it. If the virus or antigen is present, the antibody kills it and thereby stops it from being able to stick the red blood cells to each other. (09 Oct 1997) |
| haemagglutination inhibition tests | Serologic tests in which a known quantity of antigen is added to the serum prior to the addition of a red cell suspension. Reaction result is expressed as the smallest amount of antigen which causes complete inhibition of haemagglutination. (12 Dec 1998) |
| haemagglutination test | <investigation> A test in which an antigen and an antibody react to each other on the surface of a red blood cell. (09 Oct 1997) |
| haemagglutination tests | Sensitive tests to measure certain antigens, antibodies, or viruses, using their ability to agglutinate certain erythrocytes. (12 Dec 1998) |
| haemagglutination, viral | Agglutination of erythrocytes by a virus. (12 Dec 1998) |
| indirect haemagglutination test | A kind of passive agglutination in which erythrocytes, usually modified by mild treatment with tannic acid or other chemicals, are used to adsorb soluble antigen onto their surface, and which then agglutinate in the presence of antiserum specific for the adsorbed antigen. Synonym: indirect haemagglutination test. (05 Mar 2000) |
| Treponema pallidum haemagglutination test | A highly sensitive and specific test for the serologic diagnosis of syphilis; tanned sheep red blood cells are coated with the antigen of Treponema pallidum and, following absorption of non-specific patient serum antibody, a positive reaction with tanned sheep red blood cells and patient serum indicates the presence of specific antibody for Treponema pallidum in patient serum. Synonym: TPHA test. (05 Mar 2000) |
| reverse | 1. To turn back; to cause to face in a contrary direction; to cause to depart. "And that old dame said many an idle verse, Out of her daughter's heart fond fancies to reverse." (Spenser) 2. To cause to return; to recall. "And to his fresh remembrance did reverse The ugly view of his deformed crimes." (Spenser) 3. To change totally; to alter to the opposite. "Reverse the doom of death." (Shak) "She reversed the conduct of the celebrated vicar of Bray." (Sir W. Scott) 4. To turn upside down; to invert. "A pyramid reversed may stand upon his point if balanced by admirable skill." (Sir W. Temple) 5. Hence, to overthrow; to subvert. "These can divide, and these reverse, the state." (Pope) "Custom . . . Reverses even the distinctions of good and evil." (Rogers) 6. To overthrow by a contrary decision; to make void; to under or annual for error; as, to reverse a judgment, sentence, or decree. Reverse arms, a position of a soldier in which the piece passes between the right elbow and the body at an angle of 45 deg, and is held as in the illustration. To reverse an engine or a machine, to cause it to perform its revolutions or action in the opposite direction. Synonym: To overturn, overset, invert, overthrow, subvert, repeal, annul, revoke, undo. Origin: See Reverse, and cf. Revert. 1. Turned backward; having a contrary or opposite direction; hence; opposite or contrary in kind; as, the reverse order or method. "A vice reverse unto this." 2. Turned upside down; greatly disturbed. "He found the sea diverse With many a windy storm reverse." (Gower) 3. <botany> Reversed; as, a reverse shell. <medicine> Reverse bearing, a fire in the rear. <mathematics> Reverse operation, an operation the steps of which are taken in a contrary order to that in which the same or similar steps are taken in another operation considered as direct; an operation in which that is sought which in another operation is given, and that given which in the other is sought; as, finding the length of a pendulum from its time of vibration is the reverse operation to finding the time of vibration from the length. Origin: OE. Revers, OF. Revers, L. Reversus, p. P. Of revertere. See Revert. 1. That which appears or is presented when anything, as a lance, a line, a course of conduct, etc, is reverted or turned contrary to its natural direction. "He did so with the reverse of the lance." (Sir W. Scott) 2. That which is directly opposite or contrary to something else; a contrary; an opposite. "And then mistook reverse of wrong for right." (Pope) "To make everything the reverse of what they have seen, is quite as easy as to destroy." (Burke) 3. The act of reversing; complete change; reversal; hence, total change in circumstances or character; especially, a change from better to worse; misfortune; a check or defeat; as, the enemy met with a reverse. "The strange reverse of fate you see; I pitied you, now you may pity me." (Dryden) "By a reverse of fortune, Stephen becomes rich." (Lamb) 4. The back side; as, the reverse of a drum or trench; the reverse of a medal or coin, that is, the side opposite to the obverse. See Obverse. 5. A thrust in fencing made with a backward turn of the hand; a backhanded stroke. 6. <surgery> A turn or fold made in bandaging, by which the direction of the bandage is changed. Origin: Cf. F. Revers. See Reverse. Source: Websters Dictionary (01 Mar 1998) |
| reverse banding | <technique> A reverse Giemsa chromosome banding method that produces bands complementary to G-bands; induced by treatment with high temperature, low pH, or acridine orange staining; often used together with G-banding on human karyotype to determine whether there are deletions. (05 Mar 2000) |
| reverse bevel | The sloping edge of a cutting instrument. (05 Mar 2000) |
| reverse curve | In dentistry, a curve of occlusion which is convex upward. Synonym: anti-Monson curve. (05 Mar 2000) |
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